Orientation of screen when connected to external monitorSupport

My boss recently connected his Note 3 to an external monitor using a Samsung universal dock with the hdmi port. It connected fine however one thing he noticed is that when he had the phone sitting in the dock upright, as you normally would, the image on the external monitored mirrored the phone so that the image on the monitor was portrait and did not fill the screen. When he physically rotated his phone and had the dock and phone lying on their sides the monitor then matched the phone and rotated to fill the entire monitor. Does anyone know a way around this so he doesn't need to physically rotate his phone and risk it disconnecting from the dock? It's just a bit awkward so if there is a setting somewhere that would be great to have a work around.

When he plugged a mouse in to the USB port on the dock the screen on the external monitor automatically rotated to landscape mode to fill the monitor and if he unplugged it then it would go back to portrait. Maybe this is the only solution? He thought it would be at least worth checking to see if there is another setting somewhere.

Im going to try that app. I don't have a dock but I'd like to have my homescreen switch to landscape. Will ultimate rotation do that for me? I use Nova Prime and trying to force landscape on the homescreen with that doesn't work with my T-mobile Note 3.

Think it might help sstuerle explain to the boss if they are wondering why things might look 'messed' up on the screen when it goes landscape. Considering landscape orientation has different sizing and widgets sometimes don't size well to it when bouncing between the two orientations.